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Chemistry > GCSE Paper 1 > Flashcards

GCSE Paper 1 Flashcards

(77 cards)

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1
Q

What is the radius of an atom?

A

1 x 10 - 10m

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2
Q

Whats the radius of a nucleus?

A

1 x 10-14m

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3
Q

Def ionic bonding

A

When a metal and a not metal lose and gain electrons which causes them to be strongly attracted to each other

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4
Q

Def covalent bonding

A

When non-metals share electrons to become bonded together

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5
Q

What is the formula for ammonia?

A

NH3

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6
Q

How can you separate an insoluable solid from a liquid?

A

Filtration

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7
Q

How can you separate a soliable solid from a liquid? (2)

A

Evaporation
Crystallisation

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8
Q

When would you have to use crystallisation instead of evaporation

A

If the salt doesnt decompose when heated

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9
Q

What is simple distillation used for?

A

To seperate out solutions

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10
Q

How do you do simple distillation?

A

The solution is heated (lower boiling point solution evaporates first)
The vapour is then cooled and condensed down to a liquid
The rest of the solution is left behind

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11
Q

Whats the problem with simple distillation?

A

You can only use it to seperate things with very different boiling points

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12
Q

What is fractional distillation used for?

A

To seperate out a mixture of liquids

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13
Q

How does fractional distillation work?

A

The top of the flask is cooler than the bottom ensuring that only the lowest boiling point substance evaporates first as any others that evaporate will just cool and run back down the collumn.

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14
Q

Who thought of the plum pudding model?

A

JJ Thompson

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15
Q

Who was Ernest rutherford?

A

He proved the plum pudding model wrong and performed the alpha particle scattering test to show atoms had a nucleus

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16
Q

How was Rutherfords moedel different to Bohr’s model?

A

He had a field of negatively charged electrons instead of shells with electrons in

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17
Q

What was Bohr’s nuclear model?

A

He sadi that the atom had shells with electrons in, and none inbetween, his model is the same we have today (although he never theorised about protons and neutrons etc)

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18
Q

What further experiments on the structure of the atom were carried out?

A

Rutherford proved protons existed
James Chadwick discovered neutrons

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19
Q

Who was dimitri mendeleev?

A

Mendeleev left gaps in the early versions of the period table for undiscovered elements and also switched some of them if the properties didnt fit the group they were in. His predictions for undiscovered elements were very accurate

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20
Q

What compounds do alkali metals form with non metals?

A

Ionic

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21
Q

What happens when an alkali metal reacts with water?

A

The react vigorously
They produce hydrogen
They produce hydroxides (eg sodium hydroxide)

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22
Q

What happens when an alkali metal reacts with chlorine?

A

They react vigorously and form white salts called metal chlorides

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23
Q

Other than chlorine and water, what else do group 1 metals react with?

A

Oxygen to produce metal oxides.

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24
Q

How is reactivity arranged in the halogens?

A

They get less reactive as you go down the group

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25
Describe the properties of Flourine
Very reactive Yellow gas Poisonous
26
Describe the properties of chlorine
Fairly reactive Dense, green gas Poisonous
27
Describe the properties of bromine
Dense, red/brown volatile liquid Poisonous
28
Describe the properties of iodine
Dark grey crystalline solid OR purple vapour
29
How are molecules in the halogens found?
In pairs
30
How are the melting and boiling points of the halogens affected as you move down the group?
They are found in pairs
31
What is a halide?
An ion of a halogen
32
Describe the elements in group 0
They all have 8 electrons and are all inert (stable) They are monatomic and come alone They are non flammable They are colourless
33
What patterns are there in the properties of the noble gases?
Their boiling points increase as you go down the group due to more electrons and greater intermolecular forces.
34
What is ionic bonding?
The transfer of electrons between atoms
35
What kind of structure do ionic compounds have?
Regular lattice structure
36
What properties do all ionic compounds have?
High melting points High boiling points Do not conduct electricity as a solid but the ions can move in a liquid so they do as a liquid Some dissolve in water and carry electric charges
37
How do you find the empirical formula from an ionic lattice?
1. Identify the elements 2. Identify what ions those elements become 3. Balance the formula for the ions
38
Who can form a covalent bond?
Only non metals
39
How are covalent bonds very strong?
The positive nuclei are attracted to the shared electrons by electrostatic forces
40
What is the formula for methane?
CH4
41
What are the properties of simple molecular structures?
The forces in the binds may be strong but the intermolecular forces are weak Low melting and boiling points Most are gases or liquids at room temp Dont conduct electricity as they aren't charged
42
What state are polymers in at room temp?
Solid
43
What are giant covalent structures?
Macromolecules
44
Why are gisnt covalent structures so strong?
All of the atoms in the structure are bonded together by strong covalent bonds
45
Def allotrope
A different structural form of the same element in the same physical state
46
Whats the formula of a buckminster fullerene?
C60
47
What can buckminster fullerenes be used for? (3)
Drug delivery Catalyst (large surface area) Lubricants
48
What is a nanotube?
A tiny carbon cylinder (allotrope)
49
What are some properties of nanotubes? (4)
Conduct heat Conduct electricity Have a high thermal temp High tensile stength
50
What are some uses of nanotubes? (2)
Used to strengthen materials Used in electronics
51
How is metallic bonding different to the others?
Contains a delocalised electron which causes attraction between the positive metal ions and electrons creating strong intermolecular forces.
52
What three things affect the strength of intermollecular forces
Material (structure and type of bonding) Temperature Pressure
53
Whats the formula to calculate the moles?
Number of moles = mass in grams / relative formula mass
54
What's the relation between the limiting reactant and the products
The amount of limiting reactant used is directly proportional to the amount of rectant formed. Half the limiting reactant, half the products made
55
Whats the equation for concentration?
Concentration (g/dm3) = mass of solute (g) / volume of solvent (dm3)
56
How do you calculate decimeters cubed?
Divide centimeters cubed by 1000 (or ml)
57
How do you calculate mass in relation to concentration?
Mass = concentration x volume
58
Whats the neutralisation reaction between an acid and a base?
Acid + base = salt + water
59
What happens to an acid in a solution?
They ionise and produce H+ ions (protons)
60
What difference occurs when a strong and weak acid ionise in water?
A strong acid will fully ionise but a weak acid will not
61
What does it mean that a weak acid doesnt fully ionise in water?
It creates a reversible reaction and sets up an equilibrium
62
Whats the difference between a strong acid and a concentrated acid?
A strong acid is a measure of what proportion of the molecules ionise in water but the concentration is just how much acid there is in a certain volume of water.
63
How do acids and metal oxides/hydroxides react?
Acid + metal oxide/hydroxide = salt + water
64
How do acids and metal carbonates react?
Acid + metal carbonate = salt + water + carbon dioxide
65
What can you use to make a soluable salt?
An insoluable base mixed with an acid
66
How do acids and metals react?
Acid + metal = salt + hydrogen
67
How do metals react with water
Metal + water = metal hydroxide + hydrogen
68
What is oxidation and reduction?
Oxidation is the gain of oxygen Reduction is the loss of oxygen
69
When can you use reductin with carbon
You can reduce any element - (iron, zinc, copper) - lower than carbon on the reactivity series to nick its oxygen and leave you with just the ore.
70
What makes a redox reaction
Electrons being transferred
71
What are oxidation and reduction in a redox reaction?
Oxidation is the loss of electrons Reduction is the gain of electrons OIL RIG
72
What does an ionic equation show?
All of the substances that are oxidised or reduced in the reaction
73
What ore is aluminium found in?
Bauxite
74
How is aluminium's high melting point countered in electrolysis?
It is mixed with cryolite to reduce its melting point
75
How can you test for chlorine
It bleaches damp litmus paper white
76
How can energy transfer be measured
By measuring the temperature of recants and then mixing them together and taking a mew temperature to see if it is higher or lower.
77
What transfer of energy occurs in an exothermic reaction (bonds)
When new binds are formed energy is released, creating heat

Chemistry (3 decks)

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